Large area electrochromic window
First Claim
Patent Images
1. A large area variable transmission electrochromic window suitable for use as at least one of an architectural window, an automotive window, and an office partition panel comprising:
- first and second spaced optically transparent elements, said elements each having front and rear surfaces and defining a space between the rear surface of said first element and the front surface of said second element;
an electrochromic medium confined in said space whose light transmission is variable upon the application of an electric field thereto;
means for applying an electric field to said electrochromic medium to cause variation in the light transmittance of said medium wherein said means for applying an electric field include a substantially transparent conductive coating on at least one of said rear surface of said first element and said front surface of said second element, said substantially transparent conductive coating having a sheet resistance of 25 ohms/square or lower and selected from the group consisting of indium tin oxide, doped tin oxide, and doped zinc oxide;
said electrochromic medium including a redox chemical pair which colors under the application of voltage;
said electrochromic medium further including an ultraviolet stabilizer whereby said redox chemical pair is provided with enhanced ultraviolet stability;
said electrochromic window having an electrochromically active large area of length dimension at least about 14 cm and of width dimension at least about 14 cm;
said electrochromic window exhibiting a steady state leakage current of less than about 2.68 amperes per square meter when a potential of one volt is applied to said electrochromic window whereby coloration uniformity of said electrochromic window is enhanced.
0 Assignments
0 Petitions
Accused Products
Abstract
The specification discloses electrochemichromic solutions and devices based on the use of solvents comprising at least about 25% 3-hydroxypropionitrile, 3,3'"'"'-oxydipropionitrile, 2-acetylbutyrolactone, 2-methylglutaronitrile, 3-methylsulfolane and mixtures thereof. The specification also discloses vacuum backfilling techniques for filling electrochemichromic cells and enhanced UV stability through solvent self-screening.
-
Citations
21 Claims
-
1. A large area variable transmission electrochromic window suitable for use as at least one of an architectural window, an automotive window, and an office partition panel comprising:
-
first and second spaced optically transparent elements, said elements each having front and rear surfaces and defining a space between the rear surface of said first element and the front surface of said second element; an electrochromic medium confined in said space whose light transmission is variable upon the application of an electric field thereto; means for applying an electric field to said electrochromic medium to cause variation in the light transmittance of said medium wherein said means for applying an electric field include a substantially transparent conductive coating on at least one of said rear surface of said first element and said front surface of said second element, said substantially transparent conductive coating having a sheet resistance of 25 ohms/square or lower and selected from the group consisting of indium tin oxide, doped tin oxide, and doped zinc oxide; said electrochromic medium including a redox chemical pair which colors under the application of voltage; said electrochromic medium further including an ultraviolet stabilizer whereby said redox chemical pair is provided with enhanced ultraviolet stability; said electrochromic window having an electrochromically active large area of length dimension at least about 14 cm and of width dimension at least about 14 cm;
said electrochromic window exhibiting a steady state leakage current of less than about 2.68 amperes per square meter when a potential of one volt is applied to said electrochromic window whereby coloration uniformity of said electrochromic window is enhanced. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
-
Specification